basic assumption
constatation
self-evident truth

But the authors do not think hard enough about their basic assumption.

It must be these basic assumptions that he was expected to believe.

I'm trying to make a point about the basic assumptions of life.

We need a party that is willing to question basic assumptions.

In both cases there is a basic assumption of health - that they can do it.

Is it not time to examine these basic assumptions of our political systems?

The second reason why my group has problems with this report concerns its basic assumptions.

A basic assumption is that people often want to take part in positive projects.

"It makes the problem clearer to me because I have to go back to the beginning and question all the basic assumptions."

The basic assumption may be wrong, but at least it's not ridiculous.